Cement medium compound.



STATES PATENT 0 mos.

CHARLES H. LAND, OF DETROIT, MICHIGQS.

GELLENT MEDIUM COMPOUND.

-No. 895,094. I

Specification. of Letters Patent.

Patented Aug. 4, 1908.

To all whom it may concern;

Be it known that I, CHARLES H. LAND, a citizen of the United States, residing at Detroit, in the county of Wayne and Michigan, have invented certain new and useful Improvements in Cement Medium Compounds, of which the following is a specification.

My invention has for its object a novel compound which I term a cement medium colrpound. a i L y invention consists of the various elements all combined as hereinafter described and claimed, the same being adapted for a variety of uses.

My inventionis more especially designed as a means to assist the oxychlorid of inc and the oxyphosphate of zinc cements, commonly employed in dentistry as a filing for teeth to chemically and homogeneously adhere to vitreous and other substances, such as glass, porcelain, pottery andthe like.

Mv improved compound has rimarily for its object the creation thereby 0 new articles of manufacture to be employed in dentistry, and for otherness, for which I have made application for separate Letters Patent embodying the same, prepared and filGd by me in the United States Patent Ofice of date February 26, 1904, Serial No. 195,406. This medium essentially comprises oxid of zinc, or its equivalent, oxid of magnesia, combined with an ciao-resinous vehicle, phosphate of soda and other substances, in suihcient quantity to form a partial flux so that the-commind will adhere to vitreous surfaces when eated to a s'uflicient temperature.

I have found the following to be a suitable I method or process of manufacturing my 1mro ved cement medium compound, viz, by sing together either the oxid of zinc, or the OXld cit-magnesia, or both combined, with an oleo-resinous vehicle, as with the hosphste of soda as a flux in'substa ntially t e following proportions, to-wit: 1 oz. oxid of zinc, or of oxid of magnesia. 1 dwt. phosphate of soda ground to an impalpab e powder. And equal parts, of an oleo-resinou's substance,

such as balsam of copaiba, oil of tar, oil of lavender, or their equivalent. Each of the tate of oxide above named is adapted to combine with phosphoric denta cements.

This compound forms, or may form, substantially, a paint similar to that which is used in decorating china, glass or pottery and when fired to the surface of vitreous sub stances, establishes thereon a thin fil'm to which the ordinsry dental cements will chemically combine, and may be regarded as a thin coating or mediumsuitable to cause the phosphoric acid contained in dental cements, commonly-used as filling material for decayed teeth, to homogeneously adhere to the same. At same time the cement qualities will not be destroyed, in conseuence of which, when phosphoric acid and sed oxid of zinc are m'med into a pasty mass and immediately broughtin contact with a similar compound that has been first fused to a. vitreous surface, a chemical and homo eneous union becomes est-abhshedwhereby dissimilsr substances maybe made to cohere so said contained in ordinary" substantially that they will resist the action of all ordinary solutions even resisting water at the boilin pint. Under such circumstances it will e n that each a compound, enabling suchre s to be secured, is exceedingly useful as wnen applied to various dental operations, such as cementing porcelain fillings as crowns to 2119 root of natural teeth.

While I have described above certain proortions of the various ingredients enterin into my improved medium compound, would have it understood that I do not limit myself to any fined proportions of the various elements entering mm said compound, as the proportions might be varied without altering the features of my inven tion.

The medium may be srt-ially fused to a .vitrecus substance at a oout 1800 degrees Fahrenheit. The two oxids, oxid of zinc and oxid of magnesia are allied in their ac' 1\ A cement medium compound com- What I claim as my intention is:

prismi an oxid adapted to combine with oopaiba, oil of tar, and oil of lavender, subphosp oric acid and an oleo-resinous vehicle. stantially as set forth.' 10

2. A cement -compound comprisin an In testimony whereof I have signed this oxid adapted to combine with phosp oric specification in presence of two witnesses.-

5 acid, a flux, and a flowing medium. CHARLES H. LAND.

' 3. A cement media compound compose Witnesses:

N. S. WRIGHT,

of an oxid adapted to combine with phos- E. M. SPmLBURo,

phorio acid, phosphate of soda, balsam of 

